diff --git a/pyproject.toml b/pyproject.toml
index a8355cf1ad..08728c2c01 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,7 +37,7 @@ sqlalchemy2-stubs = {version = "*", allow-prereleases = true}
 
 [tool.poetry.dev-dependencies]
 pytest = "^6.2.4"
-mypy = "^0.910"
+mypy = "^0.921"
 flake8 = "^3.9.2"
 black = {version = "^21.5-beta.1", python = "^3.7"}
 mkdocs = "^1.2.1"